Process of vulcanizing rubber



,PnoeEss}or, jvULcANIzING RUBBER Helmfith Meis, Leverkusen-Wiesdorf, Germany,:

assignor to I. G. Farbenindustrie Akti'engesellschaft, Frankfort on-the Main, Germany No Drawing. Application; September 1, 19 33, I. s i al No. 687,916. In q r any s t m erfi t; 8 Claims; (oi "is 53")"" (OFFICE The present invention relates to a process of vulcanizing rubber and to new vulcanization accelerators being applied in said process.

The following examples illustrate the invention, without limiting it thereto, theparts being y weight: 7

In accordance with the invention there rare Example-1 j 35$:dplagbgfig gfifiii gf eli compounds A vulcanization mixture was prepared from:-

I v Parts Light crepe"; 50

Smoked shee 50 Zinc white Heavy spar (finely ground) Lii. Sulfur 3. 5 Tri-(dimethylamino)-phosphine; 1.0

When vulcanizing this mixturetthefollowing figures were obtained:---

a T ,1 8 mosens e i i V. I plieres3 grin/ m Sigaftggii H --supera-. gem wherein M H v r 1 a i I os her e, 1

h "RY 'Minutea r: N --N and -N Y 45 121 60 127 907 R R R 80 136 880 2 4 6 100 136, 850

stand for radicals of secondary amines, R1 to Re meaning substituted or unsubstituted hydrocarbon groups, such as alkyl groups, aryl groups, aralkyl groups, hydroaryl groups, etc., R1 and R2,

When substituting the accelerator of the above example by the same, quantity ,of tripiperidylphosphine, the following figures were obtained:-

R3 and R4, R5 and Remay also stand for a chain Heating of alkylene groups, which may be interrupted by Batrnos- Tensile hetero atoms, such as sulfur or oxygen. The 3 5331 ga fig, ,percen't main advantages of these new accelerators are mospheric that they do not tend to scorching and that'they M possess a wide curing range (plateau effect). fi 127 They may be used alone or, preferably, in ad-' 12g .915 mixture with other accelerators, more particu- V larly, accelerators containing sulfur, such as mer- 1 i f captoarylenethiazoles, thiuram .monoor, disul- Example 2 fides, additional products of carbon disulfide to the compounds of the formula given. above, which accelerators, are strongly, activated by. the acceler- A vulcanization mixture was-prepared consisting-,ofz,

ators herein disclosed. 7 Light crepe The new acceleratorscan be,fprepared,.for"ex-' Smoked sheetsample, by reacting upon'phosphorous trichloride Zinc, white U Q with any desired,secondaryamine, suchas'di Titan dioxide '15 methylamine,diethylamine, pipecoline, etc. Heavy spar (finely ground) 10 Instead of the free accelerators, salts thereof Sulfur 3.5

with suitable acids, more particularly, high mo- Stearic acid 1 lecular fatty acids, such as stearic acid, oleic Z-mercaptobenzothiazole 0. 45 acid etc. may be applied. Tri- (dimethylamino) -.phosphine 0. 45

When this mixture, the following Likewise, in the above examples the natural figures were obtained:-

.5 a mosen a Stretch in phere strength superatin kg/cm' percent mospheric Minutes 30 140 936 50 189 848 80 223 790 I 11),, I 210 753 a 1.5 atmu V pheres superatmospherlc Minutes When applying in the we instead of the tri-(dimethylaminoi-phosphine, the ccir-' responding stearate, the following figures were When applying instead of the trl-(dimethylamino) -phosphine 0,45 of trl-piperidylphosphine, the following figures were obtained:-

Heathg ;0.5 atmes- Tomi-la switch in phore strength t superatin .kg/cm t Minutes a0 130 an 50 192 so ms 714' no 21a v 740 1.5 atmos- T Dheres supera V- mospharic v f Mm, 1 15; 15;; so 25 217 s34 40"" 22a s00 60 ,m, 776 so 237 773 In the above examples the acceleratorsmentioned may be replaced, for example, bymunopiperidyI-di-(diethyiaminol -ph'osphine, monopi peridyl-di (ethylmethylamino) -phosphihe,. tripipecolyiphosphine, tii-(para-nitro- N-methylphenylamino)-ph'x is 'phii'ie e'tcQ f rubber may be partly or totally replaced by artificial rubber-like as are obtainable for example, by polymerizing a butadiene hydrocarbon, such as butadiene, isoprene and dimethylbutadiene alone or in admixture with one another or with other polymerizable compounds, such as, styrene, vinylnapthalene, acrylic acid esters or -nltriles, unsaturated ketones etc.

Therefore, when using in the claims the term rubber, the same is intended to include as well natural rubber as artificial rubber-like mamlikethoadiscload above.

I claim: I. The process which comprises vulcanizing rubber in the presence of and in contact with a compound of the probable formula:-

stand for radicals of secondary amines.

2. The process which comprises vulcanizing rubber in the presence of and in contact with tri- (dimethylamino) -phosphine.

3. The process which comprises vulcanizing I rubber in the presence of and in contact with tri-piperidyl-phosphine.

4. The process as claimed in claim 1, in which a vulcanization accelerator containing sulfur is likewise present.

5. vulcanization accelerators comprising a compound of the probable formula:,-

"/3: II e V n,

, I I PNI\,I-I I I I, III

1 wherein I I 3 Rx, R: l

-R N/ m14 R1 at .,R

stand for radicals ofsecondary amines.

6. vulcanization accelerators comprising tri- CdimethyIaminQ) -phosphine.

7. Vulcaxuzati'on accelerators; comprising tripiperidyl-phosphine. I

78.1 The rulcanizates obtained according to the process claimed in claim 1; 

